ABC introduced, then quickly cancelled, a new series of PSA's in 1986. No one knows why Zack of All Trades didn't get over with the audience better than it did, but you can't fault the network for trying.
However, what you probably don't know is who supplied the singing voice for Zack. Turns out it was the late R & B star Luther Vandross, before he really hit it big on the Top 40. Yeah, I'm stunned, too, but scope out this sample clip:
Sounds like a riff on "The Name Game" by Shirley Ellis, doesn't it?